1 Explain that a population pyramid shows the age and sex structure of a population. 2  Point to the horizontal bars, which show the percentage (or the absolute number) of males and females in each age group. 3  Have students interpret the chart.
1 Although they range from $150-$400 or more, a large capacity (25-70 pints) dehumidifier for a basement (the dampest portion of most homes) or other large area averages $200-$300.
Shopping for a dehumidifier: 1  Recommended indoor winter humidity levels are 30-40 percent. 2  To determine the humidity in your home, buy a hygrometer (humidity gauge) for $15-$80 (mechanical models are the least expensive; electronic versions cost more) and take readings in different rooms at different times. Dehumidifier capacity is generally measured by how many pints of water a unit removes from the air in 24 hours. 2  A mini-dehumidifier (1-10 pints) for a bathroom, closet or under a counter usually costs $40-$70.